[ARM] 3580/1: AT91RM9200 Timer suspend/resume support
Patch from Andrew Victor
Added suspend/resume support for the AT91RM9200 timer.
Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-at91rm9200/time.c b/arch/arm/mach-at91rm9200/time.c
index 36798a8..fc2d7d5 100644
--- a/arch/arm/mach-at91rm9200/time.c
+++ b/arch/arm/mach-at91rm9200/time.c
@@ -90,6 +90,20 @@
.handler = at91rm9200_timer_interrupt
};
+void at91rm9200_timer_reset(void)
+{
+ last_crtr = 0;
+
+ /* Real time counter incremented every 30.51758 microseconds */
+ at91_sys_write(AT91_ST_RTMR, 1);
+
+ /* Set Period Interval timer */
+ at91_sys_write(AT91_ST_PIMR, LATCH);
+
+ /* Enable Period Interval Timer interrupt */
+ at91_sys_write(AT91_ST_IER, AT91_ST_PITS);
+}
+
/*
* Set up timer interrupt.
*/
@@ -99,28 +113,30 @@
at91_sys_write(AT91_ST_IDR, AT91_ST_PITS | AT91_ST_WDOVF | AT91_ST_RTTINC | AT91_ST_ALMS);
(void) at91_sys_read(AT91_ST_SR); /* Clear any pending interrupts */
- /*
- * Make IRQs happen for the system timer.
- */
+ /* Make IRQs happen for the system timer */
setup_irq(AT91_ID_SYS, &at91rm9200_timer_irq);
- /* Set initial alarm to 0 */
- at91_sys_write(AT91_ST_RTAR, 0);
-
- /* Real time counter incremented every 30.51758 microseconds */
- at91_sys_write(AT91_ST_RTMR, 1);
-
- /* Set Period Interval timer */
- at91_sys_write(AT91_ST_PIMR, LATCH);
-
/* Change the kernel's 'tick' value to 10009 usec. (the default is 10000) */
tick_usec = (LATCH * 1000000) / CLOCK_TICK_RATE;
- /* Enable Period Interval Timer interrupt */
- at91_sys_write(AT91_ST_IER, AT91_ST_PITS);
+ /* Initialize and enable the timer interrupt */
+ at91rm9200_timer_reset();
}
+#ifdef CONFIG_PM
+static void at91rm9200_timer_suspend(void)
+{
+ /* disable Period Interval Timer interrupt */
+ at91_sys_write(AT91_ST_IDR, AT91_ST_PITS);
+}
+#else
+#define at91rm9200_timer_suspend NULL
+#endif
+
struct sys_timer at91rm9200_timer = {
.init = at91rm9200_timer_init,
.offset = at91rm9200_gettimeoffset,
+ .suspend = at91rm9200_timer_suspend,
+ .resume = at91rm9200_timer_reset,
};
+